Bahraini anti-government protesters, masked against tear gas, throw bottles of paint and petrol bombs at a police water cannon truck during clashes with riot police in Sanabis, Bahrain, on Friday, Oct. 5, 2012. Riot police used water cannons and tear gas on Friday to disperse hundreds of anti-government protesters trying to reach a heavily guarded site that was once the hub of their uprising. (AP Photo/Hasan Jamali)

Bahraini anti-government protesters, masked against tear gas, throw bottles of paint and petrol bombs at a police water cannon truck during clashes with riot police in Sanabis, Bahrain, on Friday, Oct. 5, 2012. Riot police used water cannons and tear gas on Friday to disperse hundreds of anti-government protesters trying to reach a heavily guarded site that was once the hub of their uprising. (AP Photo/Hasan Jamali)

Bahraini anti-government protesters, masked against tear gas, throw petrol bombs at a police water cannon truck during clashes with riot police in Sanabis, Bahrain, on Friday, Oct. 5, 2012. Riot police used water cannons and tear gas on Friday to disperse hundreds of anti-government protesters trying to reach a heavily guarded site that was once the hub of their uprising. (AP Photo/Hasan Jamali)

Bahraini anti-government protesters, masked against tear gas, throw petrol bombs at a police water cannon truck during clashes with riot police in Sanabis, Bahrain, on Friday, Oct. 5, 2012. Riot police used water cannons and tear gas on Friday to disperse hundreds of anti-government protesters trying to reach a heavily guarded site that was once the hub of their uprising. (AP Photo/Hasan Jamali)

Bahraini anti-government protesters, masked against tear gas, throw bottles of paint and petrol bombs at a police water cannon truck during clashes with riot police in Sanabis, Bahrain, on Friday, Oct. 5, 2012. Riot police used water cannons and tear gas on Friday to disperse hundreds of anti-government protesters trying to reach a heavily guarded site that was once the hub of their uprising. (AP Photo/Hasan Jamali)

Bahraini anti-government protesters, masked against tear gas, throw bottles of paint and petrol bombs at a police water cannon truck during clashes with riot police in Sanabis, Bahrain, on Friday, Oct. 5, 2012. Riot police used water cannons and tear gas on Friday to disperse hundreds of anti-government protesters trying to reach a heavily guarded site that was once the hub of their uprising. (AP Photo/Hasan Jamali)

Masked Bahraini anti-government protesters carry crates of homemade paint and petrol bombs into clashes with riot police in Sanabis, Bahrain, on Friday, Oct. 5, 2012. Riot police used water cannons and tear gas on Friday to disperse hundreds of anti-government protesters trying to reach a heavily guarded site that was once the hub of their uprising. The headband on the youth at right reads: "I am the next martyr." (AP Photo/Hasan Jamali)

Masked Bahraini anti-government protesters carry crates of homemade paint and petrol bombs into clashes with riot police in Sanabis, Bahrain, on Friday, Oct. 5, 2012. Riot police used water cannons and tear gas on Friday to disperse hundreds of anti-government protesters trying to reach a heavily guarded site that was once the hub of their uprising. The headband on the youth at right reads: "I am the next martyr." (AP Photo/Hasan Jamali)

Bahraini anti-government protesters react to tear gas during clashes with riot police in Sanabis, Bahrain, on Friday, Oct. 5, 2012. Riot police used water cannons and tear gas on Friday to disperse hundreds of anti-government protesters trying to reach a heavily guarded site that was once the hub of their uprising. (AP Photo/Hasan Jamali)

Bahraini anti-government protesters react to tear gas during clashes with riot police in Sanabis, Bahrain, on Friday, Oct. 5, 2012. Riot police used water cannons and tear gas on Friday to disperse hundreds of anti-government protesters trying to reach a heavily guarded site that was once the hub of their uprising. (AP Photo/Hasan Jamali)

Riot police watch for Bahraini anti-government protesters, unseen, near tire fires set by protesters in Sanabis, Bahrain, on Friday, Oct. 5, 2012. Riot police used water cannons and tear gas on Friday to disperse hundreds of anti-government protesters trying to reach a heavily guarded site that was once the hub of their uprising. (AP Photo/Hasan Jamali)

Riot police watch for Bahraini anti-government protesters, unseen, near tire fires set by protesters in Sanabis, Bahrain, on Friday, Oct. 5, 2012. Riot police used water cannons and tear gas on Friday to disperse hundreds of anti-government protesters trying to reach a heavily guarded site that was once the hub of their uprising. (AP Photo/Hasan Jamali)